package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.service.CourseContentService;
import com.lagou.service.impl.CourseContentServiceImpl;
import org.apache.commons.beanutils.BeanUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;

@WebServlet("/courseContent")
public class CourseContentServlet extends BaseServlet {

    //展示对应课程的章节与课时信息
    public void findSectionAndLessonByCourseId(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");

            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            List<Course_Section> list = contentService.findSectionAndLessonByCourseId(Integer.parseInt(course_id));

            //3.返回结果
            String result = JSON.toJSONString(list);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    //根据课程id 回显课程信息
    public void findCourseById(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.获取参数
            String course_id = request.getParameter("course_id");

            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            Course course = contentService.findCourseByCourseId(Integer.parseInt(course_id));

            //3.返回JSON数据
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name");

            String result = JSON.toJSONString(course, filter);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    //保存或修改 章节信息
    public void saveOrUpdateSection(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.获取参数 从域对象中获取
            Map<String, Object> map = (Map) request.getAttribute("map");

            //2.创建一个Course_Section
            Course_Section section = new Course_Section();

            //3.使用BeanUtils工具类 将map中的数据封装到section中
            BeanUtils.populate(section, map);

            //4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            //5.判断是否带有id 不带有id就是新增操作 否则就是修改操作
            if (section.getId() == 0) {
                //新增操作
                String result = contentService.saveSection(section);
                response.getWriter().print(result);
            } else {
                //修改操作
                String result = contentService.updateSection(section);
                response.getWriter().print(result);
            }
        } catch (IllegalAccessException | InvocationTargetException | IOException e) {
            e.printStackTrace();
        }
    }


    //修改章节状态
    public void updateSectionStatus(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.接收参数
            String id = request.getParameter("id");//章节id
            String status = request.getParameter("status");//章节状态

            //2.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();
            String result = contentService.updateSectionStatus(Integer.parseInt(id), Integer.parseInt(status));

            //3.返回结果
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    //保存或修改课时信息
    public void saveOrUpdateLesson(HttpServletRequest request, HttpServletResponse response) {

        try {
            //1.获取参数 从域对象中获取
            Map<String, Object> map = (Map) request.getAttribute("map");

            //2.创建一个Course_Lesson
            Course_Lesson lesson = new Course_Lesson();

            //3.使用BeanUtils工具类 将map中的数据封装到section中
            BeanUtils.populate(lesson, map);

            //4.业务处理
            CourseContentService contentService = new CourseContentServiceImpl();

            //5.判断是否带有id 不带有id就是新增操作 否则就是修改操作
            if (lesson.getId() == 0) {
                //新增操作
                String result = contentService.saveLesson(lesson);
                response.getWriter().print(result);
            }else {
                //修改操作
                String result = contentService.updateLesson(lesson);
                response.getWriter().print(result);
            }
        } catch (IllegalAccessException | InvocationTargetException | IOException e) {
            e.printStackTrace();
        }
    }
}
